Smoke-consumer.



' PATENTED FEB. 28, 1905.

M. DOYLE.

SMOKE CONSUMER.

APPLICATION FILED NOV. 1. 1904. v

ln//ntor.

7 MSG, fitter/ways- Itil'o. 783,998.

llshvirn TATES Patented February 98, 190%..

ATENT OFFICE.

ll llOHAEL DOYLE, OF BALTIMORE, MARYLAND, ASSlG-NOR OF ONE-HALF TO RICHARD J. ONEIL, OF BAL'IIMORE, lVIA'HYLANl).

$lVlOKE-CONSUIVIEFI.

SPECIFICATION forming part of Letters Patent No. 783,998, dated February 28, 1905. Application filed November 1, 1904. Serial No. 230,947.

To 11. 11:71.01, (12 irtllgl concern:

Be itknown that], MICHAEL Done, :1. citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful improvements in Smoke- Uonsumers, of which the following is a specilication.

This invention relates to improvements in smoke-consumers for furnaces.

One object of the invention is to provide a simple and improved device which may read ily be applied to a furnace after the latter has been built or constructed simultaneously with the building of the furnace and by means of 5 which the eiiiciency of the furnace may be greatly increased by intercepting the unconsumed combustible products which are usually carried up through the stack and discharged into the atmosphere and to return said products to the furnace and again utilized. By this invention the smoke and cinders usually discharged at the upper end of the stack are checked and drawn off through a return-flue and their efficiency increased by 5 the admixture of steam and air before again entering the lire-box. 1 am aware that it has heretofore been proposed to establish communication between the stack and fire-box through which the smoke and gases in the 3 stack may be returned to the furnace and also that air and steam have been mixed with such return products; but, so far as I am aware, none of these devices have the construction or operation employed in my device.

By my invention I propose to provide an outlet in the stack at any desired point and by means of an improved flue device supply the required amount of air and convey the products back to the furnace, and I further employ at a point adjacent said stack-outlet an improved construction of steam-supply whereby the steam will be directed across the interior of the stack in such a manner as to form what may be termed a steam abutment 15 or check, which will stop the ascent of the smoke, gases, and cinders at a point adjacent the said opening and by means of the draft in said return-flue draw off the products thus checked by the steam.

The accompanying drawings illustrate the 5 invention, in which Figure 1 shows a sectional elevation of a furnace containing a water-tube boiler and also illustrates a portion of the stack provided with my invention. Fig. 2 illustrates a hori- Zontal section through the stack on the line 2 2 of Fig. 1, and Fig. 3 illustrates a perspective view of the connection between the stack and return-flue.

In the drawings, 1 designates the ash-pitof the furnace, 2 the grate-bars, and 3 the iirebox beneath the water-tubes 4. A steam-cob lector 5 is provided in the present instance at the top of the furnace, from which a steamsupply pipe 6 leads to a point where the steam 5 is desired. This construction of furnace, however, is merelyillustrative and in no way forms a part of the present invention.

The stack 7 extends vertically at one end of the furnace and has the usual vertical flue- 7 passage 8.

Above the furnace the Wall of the stack is provided with aside opening 9, in which one end 10 of a tubular connection 11 fits, so that its passage-way 12 will be in communication with the interior of the stack. A plate 13 is secured, preferably by rivets, at the upper side of the tubular connection 11, and said plate extends horizontally from the stack and on the exterior thereof, so that direct com- 3O munication cannot be had from the exterior to the passage-way 12. A funnehshaped hoodv l4: curves upwardly and over the outer end of the plate 13'and forms another passageway, 15,0n top of the plate for the admission of air. 5 This funnel-shaped hood 14 is spaced from the vertical exterior surface 16 of the stack and leaves an air-space 17 between the two. An elbow 18 is formed at the outer end of the tubular connection and has a single vertical 9 passage 19, with which both the passage-ways l2 and 15 communicate. The passage-way in this elbow therefore forms amixing-chamber for the products escaping from the stack and the incoming air.

On the interior of the stack and at a point in line with the passage-way 12 is a curved pipesection 20, having a plurality of perforations 21 arranged in a horizontal plane. In the present instance this curved pipe-section extends a little more than half-way around the interior diameter of the stack; but in practice this may be varied as desired. It is pref.- erable that the perforations in the pipe be exceedingly small for'the purpose of economy in the use of steam.

At a point diametrically opposite the passage-way 12 the curved pipe is in communication with ahorizontal pipe 22, which enters the stack from the exterior and leads from the steam-supply pipe 6. A valve 23 in the horizontal pipe 22 enables the passage of steam to the stack to be controlled.

A vertical flue or pipe 24: is connected to the lower end of the elbow 18, and said flue extends from the elbow back to the fire-box 3, where its end 25 enters.

It will be noted that the draft for the firebox is supplied through the passage-way 15, elbow 18, and vertical flue 24:, and by this means a suction is created in the flue 24 which draws the products of combustion from the interior of the stack which have been checked by the spraying steam abutment through the passage-way 12.

The curved steam-pipe 2O sprays the steam in all directions across the staclgand the steam thus sprayed forms an abutment which acts like a damper, so that the heavier particles or products will be drawn ofi' laterally through 1 the passage-way 12. It will thus be noted that the steam is not utilized to drive the products into the passage-way 12, but merely to check the products at that point, where they can be sucked out.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is"

The combination with a furnace having a fire-box, of a stack having a passage-way and a side opening; a steam-supply pipe in said stack passage-way opposite said side opening; a flue opening into the fire-box and extending from the latter to a point adjacent the side opening in the stack, and an elbow connected to the fire-box flue and having a lower semicylindric tubular connection which projects laterally through the side opening of the stack directly opposite the steam-pipe and a horizontal plate which also extends from said stack to close the upper side of said semicylindric connection, said elbow also 11 aving a funnel-shaped hood, 14, which curves upwardly over the outer end of the horizontal plate and in a plane above the steam-pipe in the stack.

1n testimony whereof I affix my signature in presence of two witnesses.

MICHAEL DOYLE. lVitnesses:

CHARLES B. MANN, Jr G. FERDINAND Voe'r. 

